[@casiepa Moderator 8 years, 6 months ago]

Hi @djhorne,

Never seen that one before to be honest…

I would just think of:
1. Your theme is not fully supporting mobile? But you say you tested other themes.
2. You have Jetpack? There is a setting in the ‘Writing’ tab where you can ‘Optimize your site for smartphones’. Maybe it’s switched off?

That’s the only thing I’m thinking off.
Also please make sure to switch to https, because you are asking for login/password on a standard http and security wise, that’s not really a good thing!